choanocyte chambers ~10^7/cm^3: choanocytes per choanocyte chamber ≤150
||Sponges phylum Porifera
||Taylor MW, Radax R, Steger D, Wagner M. Sponge-associated microorganisms: evolution, ecology, and biotechnological potential. Microbiol Mol Biol Rev. 2007 Jun71(2):295-347. DOI: 10.1128/MMBR.00040-06 p.325 left column 2nd paragraphPubMed ID17554047
|| Reiswig, H. M. 1975. The aquiferous systems of three marine Demospongiae. J. Morphol. 145: 493-502. DOI: 10.1002/jmor.1051450407 link  Simpson, T. L. 1984. The cell biology of sponges. Springer-Verlag, New York, NY.
||P.325 left column 2nd paragraph: "The generally highly efficient removal of particles from seawater is due largely to the extraordinarily large number of choanocyte chambers (∼1×10^7 per cm^3) in sponge tissues (primary source 306). With each chamber containing as many as 150 choanocytes (primary source 371), coupled with the ability of pinacocytes (epithelial cells) to capture larger particles (refs 308, 412), any food particle passing through the intricate aquiferous system of a sponge is subjected to intense grazing pressure."